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qemu/i386-Resolve-CPU-models-to-v1-by-default.patch
Bruce Rogers 979cfb5342 Accepting request 762845 from home:bfrogers:branches:Virtualization
Include SLE feature requests, misc upstream stable bug fixes, and repair Jira feature references

OBS-URL: https://build.opensuse.org/request/show/762845
OBS-URL: https://build.opensuse.org/package/show/Virtualization/qemu?expand=0&rev=521
2020-01-10 14:18:12 +00:00

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3.4 KiB
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From: Eduardo Habkost <ehabkost@redhat.com>
Date: Thu, 5 Dec 2019 19:33:39 -0300
Subject: i386: Resolve CPU models to v1 by default
Git-commit: ad18392892c04637fb56956d997f4bc600224356
When using `query-cpu-definitions` using `-machine none`,
QEMU is resolving all CPU models to their latest versions. The
actual CPU model version being used by another machine type (e.g.
`pc-q35-4.0`) might be different.
In theory, this was OK because the correct CPU model
version is returned when using the correct `-machine` argument.
Except that in practice, this breaks libvirt expectations:
libvirt always use `-machine none` when checking if a CPU model
is runnable, because runnability is not expected to be affected
when the machine type is changed.
For example, when running on a Haswell host without TSX,
Haswell-v4 is runnable, but Haswell-v1 is not. On those hosts,
`query-cpu-definitions` says Haswell is runnable if using
`-machine none`, but Haswell is actually not runnable using any
of the `pc-*` machine types (because they resolve Haswell to
Haswell-v1). In other words, we're breaking the "runnability
guarantee" we promised to not break for a few releases (see
qemu-deprecated.texi).
To address this issue, change the default CPU model version to v1
on all machine types, so we make `query-cpu-definitions` output
when using `-machine none` match the results when using `pc-*`.
This will change in the future (the plan is to always return the
latest CPU model version if using `-machine none`), but only
after giving libvirt the opportunity to adapt.
Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1779078
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20191205223339.764534-1-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
qemu-deprecated.texi | 8 ++++++++
target/i386/cpu.c | 8 +++++++-
2 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/qemu-deprecated.texi b/qemu-deprecated.texi
index 4b4b7425ac1e8f71ad6a2becafb1..b42d8b3c5fbd7e74acc826678a90 100644
--- a/qemu-deprecated.texi
+++ b/qemu-deprecated.texi
@@ -374,6 +374,14 @@ guarantees must resolve the CPU model aliases using te
``alias-of'' field returned by the ``query-cpu-definitions'' QMP
command.
+While those guarantees are kept, the return value of
+``query-cpu-definitions'' will have existing CPU model aliases
+point to a version that doesn't break runnability guarantees
+(specifically, version 1 of those CPU models). In future QEMU
+versions, aliases will point to newer CPU model versions
+depending on the machine type, so management software must
+resolve CPU model aliases before starting a virtual machine.
+
@node Recently removed features
@appendix Recently removed features
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index de828e29d8d6a35c1f03bc4a456a..8a1993ac64bd763b7bb70c98b8b8 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -3984,7 +3984,13 @@ static PropValue tcg_default_props[] = {
};
-X86CPUVersion default_cpu_version = CPU_VERSION_LATEST;
+/*
+ * We resolve CPU model aliases using -v1 when using "-machine
+ * none", but this is just for compatibility while libvirt isn't
+ * adapted to resolve CPU model versions before creating VMs.
+ * See "Runnability guarantee of CPU models" at * qemu-deprecated.texi.
+ */
+X86CPUVersion default_cpu_version = 1;
void x86_cpu_set_default_version(X86CPUVersion version)
{